SB2021070126 - Insufficient Entropy in libtpms
Published: July 1, 2021
Security Bulletin ID
SB2021070126
Severity
Low
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Local access
Highest impact
Information disclosure
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 security vulnerability.
1) Insufficient Entropy (CVE-ID: CVE-2021-3505)
The vulnerability allows a local user to decrypt data.
The vulnerability exists in the TPM 2 implementation, which returns 2048 bit keys with ~1984 bit strength due to a bug in the TCG specification. The bug is in the key creation algorithm in RsaAdjustPrimeCandidate(), which is called before the prime number check.
Remediation
Install update from vendor's website.